ET's Deidre Behar caught up with Kelly Rowland at the premiere of True and the Rainbow Kingdom in Los Angeles on Thursday, where she opened up about hitting the gym with Bey and JAY-Z after they welcomed their twins, Rumi and Sir Carter.

"Everybody goes hard!" Rowland said of their workouts. "It's a whole bunch of us who go and work out, and we have a really good time."

"We got to Angela Davis' SoulCycle. She's incredible. She pushes you. SoulCycle is just this really incredible, mental workout that is just awesome," she added. "But Angela Davis, she is the master. There's no one like her."

As for Bey and Jay's twins, Rowland said they're just as adorable as we imagine. "You couldn't expect anything less," she gushed.

The 36-year-old singer brought her own son, Titan, along to Thursday's premiere for a "mommy date."

"I love being with my son. He's excited. I told him we were coming to see a movie. He loves the movies. He surprisingly sits down and is quiet in movies, which completely blows my mind," she said of her 2-year-old, adding that he's a "really interesting cross" between her and husband Tim Witherspoon's personalities. "He's both of us."

Rowland, who is "so excited" to be back in the studio recording new music and is "inspired by life," said Titan is taking after her in one area: "[He's] very musical."

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Titan definitely has a good ear -- Rowland shared that he's already bilingual, and she's working on language No. 3!

"He is fluent in Spanish. I'd like for him to start French. My nephew actually speaks French. And we're looking forward to, hopefully, a Diego birthday party. A Diego-themed birthday party. We'll see what happens," she said of his upcoming third birthday in November, before gushing about her friend, Serena Williams and her soon-to-be baby.